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According to data published in December 2014 by the U.S. Bureau of Labor Statistics in its annual Highlights of Women's Earnings report, in 2013, women made up 48.2% of the total number of workers in the U.S. labor force and the average woman in the United States earned 76% of what the average man did.

Also according to the same BLS report, going by the usual number of hours worked each week, the median earnings for women in the U.S. was within 10% of those for men for all but two categories: people who work 60 or more hours per week and also people who work 35 or more hours per week, but whose hours vary considerably from week to week.

Meanwhile, it would appear that U.S. men are paid more to work longer hours, but that U.S. women are paid more to work fewer hours.

But you don't have to take our word for it! Here's the data straight from Table 5 of the report for the number of workers by sex for each category of the usual number of hours worked each week:

2013: Number of Workers by Sex and Usual Number of Hours Worked Each Week

Hours Worked per Week

Number of Workers

Number of Women

Number of Men

1 to 4 hours

520,000

338,000

182,000

5 to 9 hours

1,155,000

771,000

383,000

10 to 14 hours

1,785,000

1,168,000

617,000

15 to 19 hours

2,604,000

1,760,000

844,000

20 to 24 hours

6,654,000

4,307,000

2,347,000

25 to 29 hours

3,200,000

2,081,000

1,120,000

30 to 34 hours

6,268,000

4,035,000

2,232,000

Hours Vary (usually < 35 hours)

2,478,000

1,500,000

978,000

35 to 39 hours

8,128,000

5,380,000

2,748,000

Hours Vary (usually 35 or more hours)

5,427,000

2,060,000

3,367,000

40 hours

70,466,000

32,504,000

37,963,000

41 to 44 hours

1,031,000

390,000

642,000

45 to 48 hours

5,493,000

1,957,000

3,536,000

49 to 59 hours

9,119,000

2,805,000

6,314,000

60 or more hours

4,599,000

1,173,000

3,426,000

All

129,110,000

62,316,000

66,794,000

And here's the corresponding data from the same table as it relates the median weekly earnings by the usual number of hours worked each week:

2013: Median Weekly Earnings by Sex and Usual Number of Hours Worked Each Week

Hours Worked per Week

Median Weekly Earnings (Both Sexes)

Median Weekly Earnings (Women)

Median Weekly Earnings (Men)

1 to 4 hours

$58

$56

$61

5 to 9 hours

$75

$76

$74

10 to 14 hours

$113

$115

$109

15 to 19 hours

$159

$163

$151

20 to 24 hours

$205

$202

$210

25 to 29 hours

$217

$223

$209

30 to 34 hours

$264

$270

$255

Hours Vary (usually < 35 hours)

$336

$352

$315

35 to 39 hours

$495

$507

$466

Hours Vary (usually 35 or more hours)

$672

$496

$791

40 hours

$732

$691

$771

41 to 44 hours

$880

$841

$912

45 to 48 hours

$1,054

$993

$1,097

49 to 59 hours

$1,270

$1,193

$1,317

60 or more hours

$1,373

$1,202

$1,436

All

$665

$584

$764

We thought it might be interesting to visualize all the data we've presented in table form above in a single chart. To do that, so we can show all the data with a single axis, we've calculated the percentage of all workers that are women along with the percentage of men's median weekly earnings that women earn for each category of usual hours worked per week.

What we see is that the median U.S. woman is typically being paid a 10% premium to work part time compared to a U.S. man working the same number of hours each week. As you can imagine, that kind of financial incentive would go a very long way to explaining why two-thirds of all working Americans who work less than 40 hours per week are women.

But as the number of usual hours worked each week rises, we see that situation reverses. For people who regularly work 40 up to 59 hours per week, women earn about 90% of what a man working the same number of hours does. However, as the number of hours required to earn incomes rise, we also see that fewer and fewer women are to be found working. At the topmost end, we see that for people who work 60 or more hours per week, the median income earned by a woman drops to 84% of the median working earnings of a man who puts in those kinds of hours, and also that only 26% of the total number of people who spend more than half their waking hours per week working at income-paying jobs like this are women.

U.S. women would also appear to be highly averse to working variable numbers of hours each week, which we see in the dips for the percentage share of workers who work varying hours each week with respect to those who work a steady number of hours.

While it is the combination of all these factors that results in the median weekly earnings for American women being just 76% of those for men, we find that it is the relatively higher pay rewards of part time employment for women as compared to men and the relative absence of women who choose to work 60 or more hours at income-paying jobs each week that are the greatest contributors to that statistic.

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